ging it all together actice Exercises wo possible Diels-Alder reactions are described below. For each reaction you should: Label the diene and dienophile. • Describe the stereochemistry of both the diene and dienophile. Draw the curved arrows for the reaction and predict the product(s). Describe the functional group(s) in the product(s). • Describe the stereochemistry in the product(s). Reaction 1: OCH3 OCH 3 anti thon NC Saoirn blA-syn oC 3(+/-) bib m ÓCH3 p typles Reaction 2: Electrun Doreng Gap OCH3 OCH 3 Cis CN ACN 5CN CN OCH3 OCH 3 P overl Ile ob doiup le Now, consider these questions: • Did you predict the same or different product(s) for Reactions 1 and 2? Why? Do you think that one of these reaction is faster than the other? Why? What is the heat for? How will you recognize a Diels-Alder reaction?
Electronic Effects
The effect of electrons that are located in the chemical bonds within the atoms of the molecule is termed an electronic effect. The electronic effect is also explained as the effect through which the reactivity of the compound in one portion is controlled by the electron repulsion or attraction producing in another portion of the molecule.
Drawing Resonance Forms
In organic chemistry, resonance may be a mental exercise that illustrates the delocalization of electrons inside molecules within the valence bond theory of octet bonding. It entails creating several Lewis structures that, when combined, reflect the molecule's entire electronic structure. One Lewis diagram cannot explain the bonding (lone pair, double bond, octet) elaborately. A hybrid describes a combination of possible resonance structures that represents the entire delocalization of electrons within the molecule.
Using Molecular Structure To Predict Equilibrium
Equilibrium does not always imply an equal presence of reactants and products. This signifies that the reaction reaches a point when reactant and product quantities remain constant as the rate of forward and backward reaction is the same. Molecular structures of various compounds can help in predicting equilibrium.
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